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Streptococcus faecalis bacteria. Coloured scanning electron micrograph (SEM) of Streptococcus faecalis bacteria. These bacteria are commonly found in the guts of humans and other animals. They do not normally cause disease, but they are opportunistic pathogens and may cause infections of the bloodstream when the normal defences of the host are impaired. They are important nosocomial pathogens. This means that they often infect patients when they are in hospital. Magnification: x9400 at 6x9cm size.
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